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Bradyrhizobium BclA Is a Peptide Transporter Required for Bacterial Differentiation in Symbiosis with Aeschynomene Legumes.

Ibtissem Guefrachi 1, 2, 3 Olivier Pierre 3, 1 Tatiana Timchenko 1, 3 Benoît Alunni 1, 3 Quentin Barrière 1, 3 Pierre Czernic 4 José-Antonio Villaécija-Aguilar 1 Camille Verly 1 Mickaël Bourge 5, 1 Joël Fardoux 4 Mohamed Mars 2 Eva Kondorosi 1, 6, 3 Eric Giraud 4 Peter Mergaert 1, 3
1 I2BC - Institut de Biologie Intégrative de la Cellule
2 Research Unit Biodiversity & Valorization of Arid Areas Bioressources (BVBAA)
3 PBI - Intéractions Plantes-Bactéries
Dpt Microbio - Département Microbiologie
4 UMR LSTM - Laboratoire des symbioses tropicales et méditerranéennes
5 CYTO - Cytométrie
PF I2BC - Département Plateforme
6 BRC - Biological Research Centre [Budapest]
Abstract : Nodules of legume plants are highly integrated symbiotic systems shaped by millions of years of evolution. They harbor nitrogen-fixing rhizobium bacteria called bacteroids. Several legume species produce peptides called nodule-specific cysteine-rich (NCR) peptides in the symbiotic nodule cells which house the bacteroids. NCR peptides are related to antimicrobial peptides of innate immunity. They induce the endosymbionts into a differentiated, enlarged, and polyploid state. The bacterial symbionts, on their side, evolved functions for the response to the NCR peptides. Here, we identified the bclA gene of Bradyrhizobium sp. strains ORS278 and ORS285, which is required for the formation of differentiated and functional bacteroids in the nodules of the NCR peptide-producing Aeschynomene legumes. The BclA ABC transporter promotes the import of NCR peptides and provides protection against the antimicrobial activity of these peptides. Moreover, BclA can complement the role of the related BacA transporter of Sinorhizobium meliloti, which has a similar symbiotic function in the interaction with Medicago legumes.
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Journal articles
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https://hal.archives-ouvertes.fr/hal-01433036
Contributor : Catherine Drouet <>
Submitted on : Thursday, January 12, 2017 - 1:47:15 PM
Last modification on : Sunday, December 6, 2020 - 9:20:02 AM

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CNRS | INRA | CEA | AGROPOLIS | CIRAD | I2BC | BA | UNIV-MONTPELLIER | CEA-DRF | CEA-UPSAY | JOLIOT | MONTPELLIER-SUPAGRO | INRAE

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Ibtissem Guefrachi, Olivier Pierre, Tatiana Timchenko, Benoît Alunni, Quentin Barrière, et al.. Bradyrhizobium BclA Is a Peptide Transporter Required for Bacterial Differentiation in Symbiosis with Aeschynomene Legumes.. Molecular Plant-Microbe Interactions, American Phytopathological Society, 2015, 10 (6), pp.1155-66. ⟨10.1094/mpmi-04-15-0094-r⟩. ⟨hal-01433036⟩

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